Black Box ACS235A - Manual (Page 29)

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SERVSWITCH™ BRAND FIBER KVM EXTENDERS
4.2.2 VSYNC E
NABLE
/D
ISABLE
J
UMPER
JP9
It is possible to use the Extender to connect a VGA monitor to a legacy Sun
computer that outputs Sun video with CSYNC superimposed on the green signal.
(If you do this, make sure that jumpers JP2 and JP10 in the Local Module are both
installed; see Section 4.1.1.)
In this situation, depending on the computer, the Remote Module might
express only CSYNC (composite sync) on the HSYNC lead of its VGA connector, or
it might express both CSYNC on HSYNC and VSYNC (vertical sync) on the VSYNC
lead. If your VGA monitor works fine even with both signals coming through, leave
jumper JP9 installed (the factory-default setting). But if your VGA monitor’s
picture becomes distorted if the monitor receives both CSYNC on HSYNC and
VSYNC on VSYNC, remove jumper JP9 as shown in Figure 4-7. This causes the
Remote Module to suppress the VSYNC signal so that only CSYNC is expressed.
Most VGA monitors, including most of those that have problems when they receive
both signals, work well using the CSYNC signal alone.
Figure 4-7. Setting VSYNC jumper JP9.
CSYNC and VSYNC
(factory default)
CSYNC only,
VSYNC disabled
Removed Installed
JP9